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If you have sensitive stuff on a unit, pull the drives and physically destroy them. They just don't cost that much even with today's temporarily elevated prices.
Otherwise, remember the old song, 'Fdisk, Format, Reinstall'? Still good advice - but one step further, reinstall with UBUNTU Linux. The receiver will get a top OS complete with a full set of programs & utilities that are NOT your licensed versions. All this at virtually no cost. Best wishes.